git.sesse.net Git - ffmpeg/blob - libavformat/soxdec.c

   1 /*
   2  * SoX native format demuxer
   3  * Copyright (c) 2009 Daniel Verkamp <daniel@drv.nu>
   4  *
   5  * Based on libSoX sox-fmt.c
   6  * Copyright (c) 2008 robs@users.sourceforge.net
   7  *
   8  * This file is part of FFmpeg.
   9  *
  10  * FFmpeg is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * FFmpeg is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with FFmpeg; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  23  */
  24
  25 /**
  26  * @file
  27  * SoX native format demuxer
  28  * @author Daniel Verkamp
  29  * @see http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format
  30  */
  31
  32 #include "libavutil/intreadwrite.h"
  33 #include "libavutil/intfloat.h"
  34 #include "libavutil/dict.h"
  35 #include "avformat.h"
  36 #include "internal.h"
  37 #include "pcm.h"
  38 #include "sox.h"
  39
  40 static int sox_probe(AVProbeData *p)
  41 {
  42     if (AV_RL32(p->buf) == SOX_TAG || AV_RB32(p->buf) == SOX_TAG)
  43         return AVPROBE_SCORE_MAX;
  44     return 0;
  45 }
  46
  47 static int sox_read_header(AVFormatContext *s)
  48 {
  49     AVIOContext *pb = s->pb;
  50     unsigned header_size, comment_size;
  51     double sample_rate, sample_rate_frac;
  52     AVStream *st;
  53
  54     st = avformat_new_stream(s, NULL);
  55     if (!st)
  56         return AVERROR(ENOMEM);
  57
  58     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  59
  60     if (avio_rl32(pb) == SOX_TAG) {
  61         st->codec->codec_id = AV_CODEC_ID_PCM_S32LE;
  62         header_size         = avio_rl32(pb);
  63         avio_skip(pb, 8); /* sample count */
  64         sample_rate         = av_int2double(avio_rl64(pb));
  65         st->codec->channels = avio_rl32(pb);
  66         comment_size        = avio_rl32(pb);
  67     } else {
  68         st->codec->codec_id = AV_CODEC_ID_PCM_S32BE;
  69         header_size         = avio_rb32(pb);
  70         avio_skip(pb, 8); /* sample count */
  71         sample_rate         = av_int2double(avio_rb64(pb));
  72         st->codec->channels = avio_rb32(pb);
  73         comment_size        = avio_rb32(pb);
  74     }
  75
  76     if (comment_size > 0xFFFFFFFFU - SOX_FIXED_HDR - 4U) {
  77         av_log(s, AV_LOG_ERROR, "invalid comment size (%u)\n", comment_size);
  78         return AVERROR_INVALIDDATA;
  79     }
  80
  81     if (sample_rate <= 0 || sample_rate > INT_MAX) {
  82         av_log(s, AV_LOG_ERROR, "invalid sample rate (%f)\n", sample_rate);
  83         return AVERROR_INVALIDDATA;
  84     }
  85
  86     sample_rate_frac = sample_rate - floor(sample_rate);
  87     if (sample_rate_frac)
  88         av_log(s, AV_LOG_WARNING,
  89                "truncating fractional part of sample rate (%f)\n",
  90                sample_rate_frac);
  91
  92     if ((header_size + 4) & 7 || header_size < SOX_FIXED_HDR + comment_size
  93         || st->codec->channels > 65535) /* Reserve top 16 bits */ {
  94         av_log(s, AV_LOG_ERROR, "invalid header\n");
  95         return AVERROR_INVALIDDATA;
  96     }
  97
  98     if (comment_size && comment_size < UINT_MAX) {
  99         char *comment = av_malloc(comment_size+1);
 100         if(!comment)
 101             return AVERROR(ENOMEM);
 102         if (avio_read(pb, comment, comment_size) != comment_size) {
 103             av_freep(&comment);
 104             return AVERROR(EIO);
 105         }
 106         comment[comment_size] = 0;
 107
 108         av_dict_set(&s->metadata, "comment", comment,
 109                                AV_DICT_DONT_STRDUP_VAL);
 110     }
 111
 112     avio_skip(pb, header_size - SOX_FIXED_HDR - comment_size);
 113
 114     st->codec->sample_rate           = sample_rate;
 115     st->codec->bits_per_coded_sample = 32;
 116     st->codec->bit_rate              = st->codec->sample_rate *
 117                                        st->codec->bits_per_coded_sample *
 118                                        st->codec->channels;
 119     st->codec->block_align           = st->codec->bits_per_coded_sample *
 120                                        st->codec->channels / 8;
 121
 122     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
 123
 124     return 0;
 125 }
 126
 127 AVInputFormat ff_sox_demuxer = {
 128     .name           = "sox",
 129     .long_name      = NULL_IF_CONFIG_SMALL("SoX native"),
 130     .read_probe     = sox_probe,
 131     .read_header    = sox_read_header,
 132     .read_packet    = ff_pcm_read_packet,
 133     .read_seek      = ff_pcm_read_seek,
 134 };